I need to change my pistons as I melted the others. I have a set of scales that go to 0.1g.
how close do these pistons have to be to each other
the new ones are a few grams different to each other and are all above the original piston weight
how do I get this weight down . machine the inside of the pin or off inside of piston ?
cheers

There's a pad area below the pin that you would machine down. Ideally you would get them within .25g.